Fastener



FIG. 1 is a perspective view of a fastener according to the present invention.

FIG. 2 is a left side elevation view of the fastener of FIG. 1, to which a right side elevation view is identical.

FIG. 3 is a front side elevation view of the fastener of FIG. 1, to which a rear side elevation view is identical.

FIG. 4 is a bottom plan view of the fastener of FIG. 1; and,

FIG. 5 is a top plan view of the fastener of FIG. 1.

The broken line showing of external screw threads is included for the purpose of illustrating environmental matter and forms no part of the claimed design. 

CLAIM The ornamental design for a fastener, as shown and described. 